EP0374900B1 - Système de suspension pour véhicule - Google Patents

Système de suspension pour véhicule Download PDF

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Publication number
EP0374900B1
EP0374900B1 EP89123589A EP89123589A EP0374900B1 EP 0374900 B1 EP0374900 B1 EP 0374900B1 EP 89123589 A EP89123589 A EP 89123589A EP 89123589 A EP89123589 A EP 89123589A EP 0374900 B1 EP0374900 B1 EP 0374900B1
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EP
European Patent Office
Prior art keywords
measure mode
fluid
failure
suspension system
measure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89123589A
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German (de)
English (en)
Other versions
EP0374900A2 (fr
EP0374900A3 (fr
Inventor
Shoichi Ing. C/O Mazda Motor Corp. Kamimura
Takeshi Ing. C/O Mazda Motor Corp. Edahiro
Shin Ing. C/O Mazda Motor Corp. Takehara
Toshiki Ing. C/O Mazda Motor Corp. Morita
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Mazda Motor Corp
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Mazda Motor Corp
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Publication of EP0374900A3 publication Critical patent/EP0374900A3/fr
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Publication of EP0374900B1 publication Critical patent/EP0374900B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/018—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the use of a specific signal treatment or control method
    • B60G17/0185—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the use of a specific signal treatment or control method for failure detection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B60G2202/154—Fluid spring with an accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/80—Interactive suspensions; arrangement affecting more than one suspension unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/10—Acceleration; Deceleration
    • B60G2400/102—Acceleration; Deceleration vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/10—Acceleration; Deceleration
    • B60G2400/104—Acceleration; Deceleration lateral or transversal with regard to vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/20—Speed
    • B60G2400/204—Vehicle speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/25—Stroke; Height; Displacement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/25—Stroke; Height; Displacement
    • B60G2400/252—Stroke; Height; Displacement vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/40—Steering conditions
    • B60G2400/41—Steering angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/50—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/50—Pressure
    • B60G2400/51—Pressure in suspension unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/10—Damping action or damper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/02—Retarders, delaying means, dead zones, threshold values, cut-off frequency, timer interruption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/04—Means for informing, instructing or displaying
    • B60G2600/044—Alarm means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/08—Failure or malfunction detecting means

Definitions

  • This invention relates to a vehicle suspension system as defined in the first part of claim 1.
  • Hydro-pneumatic suspension systems which comprise fluid cylinders connected between the vehicle body and the respective wheels, whereby a gas spring is connected to each of the fluid cylinders, are known in the art (JP-B 59-14365). Further there is known an active control suspension system in which the amount of fluid introduced into the fluid cylinder for each wheel is changed separately from the other fluid cylinders, whereby the properties of the suspension system are changed according to the operating condition of the vehicle.
  • a failure detecting means is provided which, when a failure occurs in the hydraulic or electronic circuitry of the system, causes a decrease of the working pressure in the fluid cylinders to a predetermined fixed load pressure which corresponds to the average vehicle weight of the vehicle and thereby a fixing of the pistons of the fluid cylinders approximately intermediately between the ends of the cylinders.
  • a ground clearance detecting means is provided which allows for adjusting the chassis height of the vehicle above the ground.
  • the system further includes a failure detecting means which, when it has been found that the ground clearance detecting means is out of order, suspends the function of the ground clearance adjustment while the vehicle is running and feeds a specified amount of fluid into the fluid cylinders, when the vehicle is standing still.
  • the primary object of the present invention is to provide a suspension system in which, in case the control system for controlling feed and discharge of hydraulic fluid to and from the fluid cylinders fails, suitable measure is taken according to the kind of the failure, thereby obtaining an excellent driving performance as long as possible without adversely affecting safety.
  • a measure mode duration determining means which determines whether a measure taken is to be maintained or not depending on the nature of the failure which had occurred.
  • the measure mode duration determining means determines, that the determination of the measure mode determining means is to be cancelled when the ignition switch of the vehicle is turned off.
  • the measure mode duration determining means determines, that the determination of the measure mode determining means is to be held until the failure is removed.
  • the failure which requires the first measure mode belong to the former and the failures which require the third measure mode belong to the latter.
  • the failures which require the second measure mode include both the former and the latter.
  • the first measure mode is taken.
  • the second measure mode is taken.
  • the third measure mode is taken and the chassis is leveled.
  • reference numerals 1, 2F and 2R respectively denote a vehicle body, a front wheel and a rear wheel.
  • a fluid cylinder 3 is connected between each wheel and the vehicle body 1.
  • the fluid cylinder 3 comprises a cylinder body 3a and a piston 3b which is received in the cylinder body 3a and forms a liquid pressure chamber 3c in the cylinder body 3a.
  • the piston 3b is connected to a piston rod 3d the upper end of which is connected to the vehicle body 1.
  • the cylinder body 3a is connected to the wheel at the lower end thereof.
  • a gas spring 5 is connected to the liquid pressure chamber 3c of each fluid cylinder 3 by way of a communicating passage 4.
  • the inner space of each gas spring 5 is divided into a gas chamber 5f and a liquid pressure chamber 5g by a diaphragm 5e, and the liquid pressure chamber 5g is communicated with the liquid pressure chamber 3c of the fluid cylinder 3.
  • Each fluid cylinder 3 is connected to a hydraulic pump 8 by way of a liquid pressure passage (high pressure line) 10.
  • a flow control valve 9 which is provided in the liquid pressure passage 10 for each fluid cylinder 3 controls feed and discharge of hydraulic fluid to and from the fluid cylinder 3.
  • a main pressure sensor 12 detects the discharge pressure of the hydraulic pump 8 (more strictly, the pressure of accumulated oil at accumulators 22a and 22b which will be described later), cylinder pressure sensors 13 detect the liquid pressure in the liquid pressure chambers 3c of the respective fluid cylinders 3c, chassis height sensors 14 detect the chassis heights at the respective wheels (cylinder stroke), vertical acceleration sensors 15 detect the vertical accelerations of the vehicle at the respective wheels, a lateral acceleration sensor 16 detects the lateral acceleration of the vehicle, a steering angle sensor 17 detects the turning angle of the front wheels 2F (as the dirigible wheels), a pair of vehicle speed sensors 18 detect the vehicle speed, and valve position sensors 19 detect the stroke position of the respective flow control valves 9.
  • the detecting signals of these sensors 12 to 19 are input into a controller 20 which may be of a CPU, for instance, and the controller 20 changes the suspension properties on the basis of the detecting signals.
  • a controller 20 which may be of a CPU, for instance, and the controller 20 changes the suspension properties on the basis of the detecting signals.
  • the cylinder pressure sensors 13, the chassis height sensors 14 and the vertical acceleration sensors 15 for the front wheels 2F are not shown.
  • the hydraulic pressure circuit which controls feed and discharge of the hydraulic fluid to and from the fluid cylinders 3 is shown in Figure 2.
  • the hydraulic pump is a variable volume type swash plate piston pump and is connected to a hydraulic pump 21 for a power steering system, so that they form a two-throw pump.
  • the hydraulic pump 21 is driven by a motor 21a.
  • the liquid pressure passage 10 connected to the hydraulic pump 8 is provided with three accumulators 22a which are connected thereto through the same connection.
  • the liquid pressure passage 10 branches into a front wheel side passage 10F and a rear wheel side passage 10R at the connection of the accumulators 22a.
  • the front wheel side passage 10F branches into left and right front wheel side passages 10FL and 10FR which are respectively communicated with the liquid pressure chambers 3c of the fluid cylinders 3FL and 3FR for the left and right front wheels.
  • the rear wheel side passage 10R is provided with an accumulator 22b and branches into left and right rear wheel side passages 10RL and 10RR at a portion downstream of the accumulator 22b.
  • the left and right rear wheel side passages 10RL and 10RR are respectively communicated with the liquid pressure chambers 3c of the fluid cylinders L and 3RR for the left and right rear wheels.
  • Gas spring groups 5FL, 5FR, 5RL and 5RR each consisting of four gas springs 5a to 5d are respectively communicated with the liquid pressure chambers 3c of the corresponding fluid cylinders 3 by way of communicating passages 4.
  • Each of the gas springs 5a to 5d are connected to the communicating passage 4 by way of an orifice 25.
  • the orifices 25 exhibit attenuating effect and the gas in the gas chambers 5f of the gas springs 5a to 5d exhibit damping effect.
  • An attenuation changing valve 26 for changing the effective cross-section area of the communicating passage 4 is provided in the communicating passage 4 between the first and second gas springs 5a and 5b. The attenuation changing valve 26 moves between an open position where it wide opens the communicating passage 4 and a closed position where it substantially narrows the effective cross-sectional area of the communicating passage 4.
  • An unload valve 27 and a flow control valve 28 are connected to the liquid pressure passage 10 upstream of the accumulators 22a.
  • the unload valve 27 moves between an introducing position where it introduces the hydraulic oil discharged from the hydraulic pump 8 into a swash plate actuating cylinder 8a so that the oil discharge rate of the hydraulic pump 8 is reduced and a discharge position where it is discharges the hydraulic oil in the cylinder 8a.
  • the unload valve 27 moves from the discharge position to the introducing position when the discharge pressure of the hydraulic pump 8 exceeds a predetermined upper limit (160 ⁇ 10kgf/cm2), and stays in the introducing position until the discharge pressure of the hydraulic pump 8 falls below a predetermined lower limit (120 ⁇ 10kgf/cm2), thereby holding the discharge pressure of the hydraulic pump 8 within a predetermined range, i.e., 120 to 160kgf/cm2.
  • the flow control valve 28 moves between an introducing position where it introduces the hydraulic oil discharged from the hydraulic pump 8 into a swash plate actuating cylinder 8a through the unload valve 27 and a discharge position where it discharges the hydraulic oil in the cylinder 8a to an oil reservoir 29 through the unload valve 27, thereby holding constant the pressure difference between the pressure in the liquid pressure passage 10 upstream of a constriction 30 and that downstream of the constriction 30 and holding constant the discharge rate of the hydraulic pump 8 while the discharge pressure of the hydraulic pump 8 is held in the predetermined range by the unload valve 27.
  • To each of the fluid cylinders 3 is fed the hydraulic oil accumulated in the accumulators 22a and 22b.
  • the pressure of the hydraulic oil accumulated in the accumulators 22a and 22b is referred to as the main pressure.
  • the flow control valve assembly 9 comprises a feed side flow control valve 35 provided in the left front wheel side passage 10FL and a discharge side flow control valve 37 provided in a low pressure line 36 through which the hydraulic oil in the left front wheel side passage 10FL is discharged to the reservoir 29.
  • Each of the flow control valves 35 and 37 moves between an open position and a closed position and is provided with a built-in differential valve which holds the hydraulic pressure constant at a predetermined value when the flow control valve is in the open position.
  • a check valve 38 which operates in response to a pilot pressure is provided in the left front wheel side passage 10FL between the feed side flow control valve 35 and the fluid cylinder 3FL.
  • To the check valve 38 is applied the hydraulic pressure in the liquid pressure passage 10 upstream of the feed side flow control valve 35 (i.e., the main pressure) as the pilot pressure through a pilot line 39.
  • the check valve 38 is closed when the pilot pressure is not higher than 40kgf/cm2. That is, feed of the hydraulic oil to the fluid cylinder 3 and discharge of the hydraulic oil from the same are both possible only when the main pressure is higher than 40kgf/cm2.
  • a fail-safe valve 41 is provided in a communicating passage 42 which communicates the low pressure line 36 and a portion of the liquid pressure passage 10 downstream of the accumulators 22a. When a failure occurs, the fail-safe valve 41 opens to return the hydraulic oil in the accumulators 22a and 22b and lower the pressure in the hydraulic pressure circuit.
  • a constriction 43 is provided in the pilot line 39 and delays closure of the check valve 38 (e.g., for one second) when the fail-safe valve 41 opens.
  • Reference numeral 44 denotes a relief valve which opens and returns the hydraulic oil in the fluid cylinders to the low pressure line 36 when the hydraulic pressure in the fluid cylinders 3FL and 3FR for the front wheels becomes abnormally high.
  • a return accumulator 45 is provided in the low pressure line 36 and accumulate pressure when the hydraulic oil is discharged from the fluid cylinders 3.
  • the controller 20 includes a chassis height control system which causes the chassis height to a desired height on the basis of the detecting signals of the chassis height sensors 14, a vertical vibration control system which reduces the vertical vibration of the vehicle body on the basis of detecting signals of the vertical acceleration sensors 15a, a load control system which equalizes the loads supported on the left and rear wheels for each of the front wheels and rear wheels on the basis of the detecting signals of the cylinder pressure sensors 13, and a fluid cylinder control system which improves the response of the fluid cylinders 3 during cornering on the basis of the detecting signals of lateral acceleration sensor 16, the steering angle sensor 17 and the vehicle speed sensor 18.
  • controller 20 When one or more of the components of these control systems fail, the controller 20 performs a fail-safe function in the manner shown in Figure 3.
  • the controller 20 first determines whether flag F (the function of which will become apparent later) is "1". (step S1) When it is determined in step S1 that the flag F is not "1", the detecting signals of the sensors 12 to 19 are input in step S2 and the controller 20 determines in step S3 whether a failure has occurred on the basis of the detecting signals. When it is determined in step S3 that no failure has occurred, the controller 20 immediately returns. Otherwise the controller 20 proceeds to step S4, and determines the kind of the failure and determines the measure mode to be taken according to the kind of the failure.
  • the failures in the control systems are divided into three types, A-type, B-type and C-type, and first to third measure modes are respectively taken for the A-type, B-type and C-type failures.
  • first measure mode warning is just given and the control of feed and discharge of hydraulic fluid to and from the fluid cylinders is continued.
  • the second measure mode is taken, the control of feed and discharge of hydraulic fluid to and from the fluid cylinders is interrupted with the chassis height fixed to the present height.
  • the third measure mode is taken, the fluid in the fluid cylinders being discharged and the chassis height being lowered.
  • the controller 20 subdivides the failure into B-1-type and B-2-type according to whether the measures for the failure have to be continued until the failure is removed or may be interrupted when the ignition switch of the vehicle is turned off.
  • the measure mode is continued until the failure is removed
  • the measures for the failure is interrupted when the ignition switch of the vehicle is turned off.
  • the controller 20 lights the warning lamp W, opens the fail-safe valve 41, and wide opens both the flow control valves 35 and 37. (steps S6 to S8) A predetermined time after the opening of the flow control valves 35 and 37, the controller 20 closes both the flow control valves 35 and 37. (steps S9 and S10) The predetermined time substantially corresponds to the time by which the constriction 43 delays closure of the check valve 38, and may be about one second, for instance. Thereafter, the controller 20 sets the flag F to "1" and returns. (step S11)
  • step S12 determines in step S12 whether the failure is of B-1-type.
  • the controller 20 lights the warning lamp W, closes both the flow control valves 35 and 37, and opens the fail-safe valve 41.
  • step S13 to S14 Thereafter, the controller 20 sets the flag F to "1" and returns.
  • step S16 Otherwise, the controller 20 determines in step S17 whether the failure is of B-2-type.
  • the controller 20 lights the warning lamp W, closes both the flow control valves 35 and 37, and opens the fail-safe valve 41.
  • step S18 to S20 Therafter, the controller 20 sets the flag F to "1" and returns.
  • step S17 When it is determined in step S17 that the failure is not of B-2-type, the controller 20 determines in step S22 whether the failure is of the A-type. When it is determined that the failure is of the A-type, the controller 20 lights the warning lamp W in step S23, and returns after setting the flag F to "1" in step S24. When it is determined in step S22 that the failure is not of the A-type, that is, when the failure is not of the A-type, the B-type or the C-type, the controller 20 returns after interrupting the control in step S25.
  • step S1 determines whether the failure is of the B-1-type or the C-type. When it is determined that the failure is of the B-1-type or the C-type, the controller 20 immediately returns. Otherwise, the controller 20 determines in step S27 whether the ignition switch is off. When it is determined that the ignition switch is off, the controller 20 returns after setting the flag F to "0" in step S28. Otherwise, the controller 20 returns immediately.
  • the following phenomena indicate occurrence of a failure which belongs to the A-type failure.
  • the following phenomenon indicates occurrence of a failure which belongs to the B-2-type failure.
  • the present invention is applied to the suspension system having both the fluid cylinders and the gas springs in the embodiment described above, the present invention can be applied to the suspension system which is not provided with gas springs.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (8)

  1. Système de suspension de véhicule comportant des cylindres hydrauliques (3) reliés entre la caisse du véhicule (1) et les roues respectives (2F, 2R), un système de commande de fluide qui commande l'alimentation et l'évacuation du fluide hydraulique vers et depuis les cylindres hydrauliques (3) et modifie les propriétés de suspension du système de suspension, et des moyens de détection de panne (12 à 19; 20) qui détectent une panne apparaissant dans le système de commande de fluide et amènent une mesure de sécurité à être réalisée qui peut prévoir que la commande d'alimentation et d'évacuation hydraulique vers et depuis les cylindres hydrauliques (3) est interrompue et que la hauteur du châssis au-dessus du sol est fixée à une hauteur prédéterminée, caractérisé en ce que le système de suspension comporte des moyens de détermination de mode de mesure (20) qui reçoivent un signal provenant des moyens de détection de panne (12 à 19; 20) et déterminent lequel des premier à troisième modes de mesure (A, B, C) doit être assuré sur la base du type de panne représenté par le signal, un avertissement étant simplement donné et la commande de l'alimentation et de l'évacuation du fluide hydraulique vers et depuis les cylindres hydrauliques (3) étant poursuivie lorsque que le premier mode de mesure (A) est assuré, la commande de l'alimentation et de l'évacuation du fluide vers et depuis les cylindres hydrauliques (3) étant interrompue avec la hauteur du châssis fixée à la hauteur présente lorsque le deuxième mode de mesure (B) est assuré, et le fluide dans les cylindres hydrauliques (3) étant évacué et la hauteur du châssis étant abaissée lorsque le troisième mode de mesure (C) est assuré, et des moyens de réalisation de mode de mesure (20) qui reçoivent un signal provenant des moyens de détermination de mode de mesure et réalisent le mode de mesure déterminé par les moyens de détermination de mode de mesure.
  2. Système de suspension de véhicule selon la revendication 1, caractérisé en ce que ledit système de commande de fluide comporte un accumulateur (22a) qui accumule le fluide hydraulique afin d'augmenter la pression hydraulique à une valeur prédéterminée, des soupapes de commande d'écoulement (9) qui sont prévues dans les passages hydrauliques (10FL, 10FR, 10RL, 10RR) vers les cylindres hydrauliques respectifs (3) et commandent l'écoulement du fluide hydraulique à travers les passages hydrauliques, un clapet anti-retour (38) qui est prévu dans le passage hydraulique vers chaque cylindre hydraulique entre le cylindre hydraulique et la soupape de commande d'écoulement, un clapet de décharge (44) qui évacue le fluide hydraulique dans l'accumulateur (22a) et des moyens de retard (43) qui amènent le clapet anti-retour à se fermer à un moment prédéterminée après l'ouverture du clapet de décharge.
  3. Système de suspension de véhicule selon la revendication 2, caractérisé en ce que ledit clapet anti-retour (38) est fermé sous l'effet de la pression hydraulique appliquée dessus par l'accumulateur (22a) par l'intermédiaire d'un passage de pression pilote (39), et lesdits moyens de retard comportent un étranglement (43) prévu dans le passage de pression pilote (39).
  4. Système de suspension de véhicule selon l'une quelconque des revendications 1 à 3, caractérisé en ce que lesdits moyens de réalisation de mode de mesure (20) délivrent un signal qui amène les soupapes de commande d'écoulement (9) à se fermer et un signal qui amène les clapets anti-retour (38) à s'ouvrir lorsque le deuxième mode de mesure (B) doit être assuré.
  5. Système de suspension de véhicule selon l'une quelconque des revendications 1 à 3, caractérisé en ce que lesdits moyens de réalisation de mode de mesure délivrent un signal qui amène les clapets anti-retour (38) à s'ouvrir et un signal qui amène les soupapes de commande d'écoulement (9) à s'ouvrir au moins pendant une durée prédéterminée lorsque le troisième mode de mesure (C) doit être assuré.
  6. Système de suspension de véhicule selon l'une quelconque des revendications 1 à 5, caractérisé en qu'au moins un ressort à gaz (5FL, 5FR, 5RL, 5RR) est relié à chacun des cylindres hydrauliques.
  7. Système de suspension de véhicule selon l'une quelconque des revendications 1 à 6, caractérisé en ce que des moyens de détermination de durée de mode de mesure (50) sont prévus et déterminent si la détermination des moyens de détermination de mode de mesure doit être annulée lorsque le contact d'allumage du véhicule est coupé ou doit être maintenue jusqu'à ce que la panne soit supprimée, et en ce que les moyens de réalisation de mode de mesure reçoivent un signal provenant des moyens de détermination de mode de mesure et des moyens de détermination de durée de mode de mesure et réalisent le mode de mesure déterminé par les moyens de détermination de mode de mesure.
  8. Système de suspension selon la revendication 7, caractérisé en ce que la détermination des moyens de détermination de mode de mesure est annulée lorsque le contact d'allumage du véhicule est coupé au cas où la panne est du type pour lequel le premier mode de mesure (A) doit être assuré et en ce que la détermination des moyens de détermination de mode de mesure est maintenue jusqu'à ce que la panne soit supprimée au cas où la panne est du type pour lequel le troisième mode de mesure (C) doit être assuré.
EP89123589A 1988-12-20 1989-12-20 Système de suspension pour véhicule Expired - Lifetime EP0374900B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP322847/88 1988-12-20
JP63322847A JPH082724B2 (ja) 1988-12-20 1988-12-20 車両のサスペンション装置

Publications (3)

Publication Number Publication Date
EP0374900A2 EP0374900A2 (fr) 1990-06-27
EP0374900A3 EP0374900A3 (fr) 1991-04-10
EP0374900B1 true EP0374900B1 (fr) 1994-01-19

Family

ID=18148265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89123589A Expired - Lifetime EP0374900B1 (fr) 1988-12-20 1989-12-20 Système de suspension pour véhicule

Country Status (4)

Country Link
US (1) US4973855A (fr)
EP (1) EP0374900B1 (fr)
JP (1) JPH082724B2 (fr)
DE (1) DE68912546T2 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2702535B2 (ja) * 1989-01-17 1998-01-21 マツダ株式会社 車両のサスペンション装置
JP2702536B2 (ja) * 1989-01-17 1998-01-21 マツダ株式会社 車両のサスペンション装置
JP2685268B2 (ja) * 1989-01-19 1997-12-03 マツダ株式会社 車両のサスペンション装置
JP2685267B2 (ja) * 1989-01-19 1997-12-03 マツダ株式会社 車両のサスペンション装置
EP0449147B1 (fr) * 1990-03-23 1996-06-05 Mazda Motor Corporation Système de suspension pour un véhicule automobile
DE4118116A1 (de) * 1991-06-03 1992-12-10 Bayerische Motoren Werke Ag Hydraulikeinrichtung, insbesondere zur stabilisierung und niveauregelung eines kraftfahrzeugs
US5161579A (en) * 1991-06-06 1992-11-10 Hadley Products, Division Of Nelson Metal Products, Corp. Leveling valve for air springs
US5438514A (en) * 1991-12-27 1995-08-01 Atsugi Unisia Corporation Apparatus for controlling damping coefficient for vehicular shock absorber
US5330225A (en) * 1992-01-24 1994-07-19 Hr Textron Inc. Passive vehicle suspension system
DE4231641C2 (de) * 1992-09-22 1996-12-12 Daimler Benz Ag Federbein für Federungssysteme von Kraftfahrzeugen
US6505108B2 (en) 2000-03-01 2003-01-07 Delphi Technologies, Inc. Damper based vehicle yaw control
DE10055108A1 (de) * 2000-11-07 2002-05-08 Daimler Chrysler Ag Luftfederung mit geschlossenem Druckluftsystem
SE0203382L (sv) * 2002-11-15 2004-05-16 Volvo Lastvagnar Ab System och metod för att diagnostisera stötdämpare
JP4082272B2 (ja) * 2003-05-15 2008-04-30 トヨタ自動車株式会社 車両用油圧制御回路の異常判定装置
JP4648126B2 (ja) * 2005-08-05 2011-03-09 本田技研工業株式会社 車両用サスペンション装置
DE102023108631A1 (de) * 2023-04-04 2024-10-10 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Dämpfungsanordnung für eine Achse eines Kraftfahrzeugs und Kraftfahrzeug

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914365A (ja) * 1982-07-14 1984-01-25 Mitsubishi Electric Corp 交−直変換装置の余裕角検出装置
JPS5979320A (ja) * 1982-10-28 1984-05-08 Yamaha Motor Co Ltd 空気圧調整装置
JPS59121216U (ja) * 1983-02-04 1984-08-15 三菱自動車工業株式会社 車高調整装置
JP2681157B2 (ja) * 1985-03-20 1997-11-26 トキコ 株式会社 サスペンシヨン装置
JPS6239312A (ja) * 1985-08-16 1987-02-20 Mazda Motor Corp 車高調整装置
JPS6247408U (fr) * 1985-09-13 1987-03-24
JP2532059B2 (ja) * 1985-09-13 1996-09-11 日産自動車株式会社 車両のサスペンシヨン制御装置
JPH0733123B2 (ja) * 1986-02-25 1995-04-12 トヨタ自動車株式会社 車輌用車高調整式ロ−ル制御装置
JPS62199509A (ja) * 1986-02-28 1987-09-03 Hino Motors Ltd 車高調整装置
GB8610842D0 (en) * 1986-05-02 1986-06-11 Bl Tech Ltd Suspension system
DE3638574A1 (de) * 1986-11-12 1988-05-26 Rexroth Mannesmann Gmbh Anordnung zur drucksteuerung eines daempfungszylinders fuer die abfederung von fahrzeugen
JPS63188511A (ja) * 1987-01-30 1988-08-04 Nissan Motor Co Ltd 能動型サスペンシヨン
JPH0625365Y2 (ja) * 1987-06-12 1994-07-06 株式会社ユニシアジェックス 車両用アンチスカット制御装置
US4805923A (en) * 1987-12-16 1989-02-21 Ford Motor Company Adaptive control system for operating adjustable automotive suspension units

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
& JP-A-62 199509 (HINO MOTORS LTD) 3 September 1987, *

Also Published As

Publication number Publication date
EP0374900A2 (fr) 1990-06-27
DE68912546D1 (de) 1994-03-03
US4973855A (en) 1990-11-27
JPH02169317A (ja) 1990-06-29
JPH082724B2 (ja) 1996-01-17
EP0374900A3 (fr) 1991-04-10
DE68912546T2 (de) 1994-05-11

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